Abstract
Summary
1. Intact embryos of the grasshopper, Melanoplus differentialis, show similar rates of endogenous O2 uptake when suspended in isotonic, Ringer or sucrose solution. 2. Homogenates of embryos suspended in Ringer solution show much higher O2 uptake than those suspended in isotonic sucrose solution. 3. Isolated intact nuclei suspended in Ringer solution show much higher G2 uptake than those suspended in isotonic sucrose solution. 4. Isotonic sugar solution affects the endogenous O2 uptake of only nuclei and no other parts of the embryonic cell. 5. Supernatants (cytoplasm minus nuclei) suspended in isotonic sucrose show greater stimulation of O2 uptake by addition of succinate than when suspended in Ringer solution.
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